Anyone got GCSEs coming up?

Although Im 19, I have a GCSE maths exam next week! I missed a lot of school and never really attempted to go for GCSE's again so enrolled onto a a part-time maths GCSE course... currently I have C,C from the other 2 previous exams, Im finding the topic for the final exam kinda hard if Im honest, I hope even if I get a D that I'll get a C overall, but I just dont know.